Berlin 2024 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Focus Session: Novel Approaches to Surface Plasmon Generated Charges and Heat for Photocatalysis I (joint session O/CPP)
CPP 32.5: Vortrag
Mittwoch, 20. März 2024, 16:15–16:30, MA 141
Measurement of temperature gradients at plasmonic metal surface using thermosensitive microgels — •Yulia Gordievskaya1, Nino Lomadze1, Se-Hyeong Jung2, Andrij Pich2,3, and Svetlana Santer1 — 1University of Potsdam, Potsdam, Germany — 2RWTH Aachen University, Aachen, Germany — 3Aachen Maastricht Institute for Biobased Materials (AMIBM), Geleen, The Netherlands
Microgels are recognized for their remarkable responsiveness to changes in environmental conditions[1]. Here, we presented a novel method for local temperature determination in aqueous solutions by observing the inhomogeneous collapse of microgels positioned at plasmonic metal surface. The surface is a variable-thickness gold layer(5-30nm) deposited on glass coated with titanium oxide(<1nm). The localized laser irradiation of the substrate results in the absorption of light by the gold layer, converting it into heat [2]. We studied how the laser wavelength and power levels, as well as distance from the irradiation spot influence the size and shape of the thermosensitive PNIPAM microgel. The obtained dependences allowed us to construct a comprehensive temperature distribution profile relative to the irradiation point.
We thank SFB 1636: Elementary processes of light driven reactions at the nanoscale. [1] J. Jelken, S.-H. Jung, N. Lomadze, Yu.D. Gordievskaya, E.Yu. Kramarenko, A. Pich, S. Santer. Advanced Functional Materials 32.2 (2022), p. 2107946. [2] V. Muraveva, M. Bekir, N. Lomadze, R. Großmann, C. Beta, S.Santer. Applied Physics Letters 120.23 (2022), p. 231905.